Why wasn't Jr's response, "WHAT? The Russian government is supporting my father? What are the other 'PARTS' of that support?"
This email proves the Trump family not only KNEW of that support. They were EXPECTING it.
"Thanks Rob, but this is inappropriate. We wouldn't accept help from Russia - or any other government - to win an election. That would be unpatriotic."
[then alternate Don Jr. proceeds to report the contact to the FBI].